I must be the only one who have no problems with playing with the circle pad.
Saying you never have trouble doesn't make the problem go away for others. It's a fact that the circle pad is not ideal for this game because of the precision it requires and the lack of any "notches" to give you an idea on where you're pointing the circle pad while playing only hurts the circle pad even more.
I get so focused in a match a lot of the time that it's not possible for me to look at where I'm pointing the circle pad
or I assume it will read my diagonal input as Up B and
not Side B. When you're playing a character like Greninja who requires you to change his trajectory on his recovery through the use of the circle pad, it creates this issue with performing Side B on accident because you're trying to preemptively steer his recovery (Up B) a certain direction so you don't
always go the same path and get edgeguarded. I wouldn't be surprised if this same issue applies to both the spacies and even Pikachu as well.
But it's worse for Greninja because of how his Side B works and I'm so annoyed that, despite how certain I am at where the circle pad is, it still reads my Up B as a Side B instead and I either die because of it or nearly SD and put myself in a bad situation.
It's just an imprecise input for analogue control which Smash is
heavily based around.